code: def testFortran(self):
      intercomm = self.INTERCOMM
      fint = intercomm.py2f()
      newcomm = MPI.Comm.f2py(fint)
      self.assertEqual(newcomm, intercomm)
      self.assertIs(type(newcomm), MPI.Intercomm)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 4 for calling the BaseTestIntercomm obj's underlying member method code with example usage: obj.testFortran() without return types